Most people still have a very last-century idea of what dinosaurs were like. No, T. rex didn't stand upright; lots of dinos were actually feathered, not leathery; and they may have been killed by a comet, not an asteroid.

Now there's some new research to further muddle your mental image: Some of those clumsy-looking land dinosaurs, like the early tyrannosaur, may have actually been strong swimmers.